Semiconductor laser drive apparatus
AssigneeTopcon Corporation
InventorsMichio Waki, Shinzo Takada
Life of this patent
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Abstract
A semiconductor laser drive apparatus having a semiconductor laser source (LD) for generating a laser light; a switching means (Q2) for supplying the semiconductor laser source (LD) with a first modulated signal (S2) for driving the semiconductor laser source (LD) on the basis of a second modulated signal (S1); a current source (6) for supplying the switching means (Q2) with a current for producing the first modulated signal (S2) in the switching means (Q2); and a bias adjust means (VR) for adjusting a bias direct-current to be added to the first modulated signal (S2).
Claims20
A semiconductor laser drive apparatus comprising:
- a semiconductor laser source (LD) for generating a laser light;
- a switching means (Q2) for supplying the semiconductor laser source (LD) with a first modulated signal (S2) for driving the semiconductor laser source (LD) on the basis of a second modulated signal (S1);
- a current source (6) for supplying the switching means (Q2) with a current for producing the first modulated signal (S2) in the switching means (Q2);
- and
- a base adjusting means (VR) operatively positioned with respect to said switching means and said semiconductor laser source for adjusting a bias direct-current (IB) to be applied to the semiconductor laser source to bias the first modulated signal (S2).
A semiconductor laser drive apparatus comprising:
- a semiconductor laser source (LD) for generating a laser light;
- a switching means (Q2) for supplying the semiconductor laser source (LD) with a first modulated signal (S2) for driving the semiconductor laser source (LD) on the basis of a second modulated signal (S1), wherein the impedance of the switching means (Q2) in operation is smaller than that of the semiconductor laser source (LD) in operation;
- a first unit (3) comprising the semicondcutor laser source (LD) and the switching means (Q2);
- a current source (6) for supplying the switching means (Q2) with a current for producing the first modulated signal (S2) in the switching means (Q2);
- a coupling means (7,8) for coupling the switching means (Q2) with the second modulated signal (S1);
- a second unit (5) comprising the current source (6) and the coupling means (7,8);
- and
- a bias adjusting means (VR) operatively positioned with respect to said switching means and said semiconductor laser source for adjusting a bias direct-current (IB) to be applied to the semiconductor laser source to bias the first modulated signal (S2).
Dependencies are inferred from the claim text.